binderRpcBenchmark: test more data sizes

Data on Pixel 3.

Tests suffixes:
        .../0 is KERNEL
        .../1 is RPC
...
------------------------------------------------------------------------------------
Benchmark                                          Time             CPU   Iterations
------------------------------------------------------------------------------------
BM_pingTransaction/0                           34506 ns        15936 ns        44173
BM_pingTransaction/1                           44578 ns        23682 ns        29419
BM_repeatTwoPageString/0                      268895 ns       133951 ns         5542
BM_repeatTwoPageString/1                      273066 ns       136871 ns         4060
BM_throughputForTransportAndBytes/0/64         41647 ns        20978 ns        31161
BM_throughputForTransportAndBytes/1/64         50865 ns        26653 ns        27674
BM_throughputForTransportAndBytes/0/1024       45359 ns        22866 ns        36708
BM_throughputForTransportAndBytes/1/1024       58353 ns        30732 ns        24405
BM_throughputForTransportAndBytes/0/2048       42337 ns        21340 ns        31918
BM_throughputForTransportAndBytes/1/2048       54608 ns        28429 ns        26312
BM_throughputForTransportAndBytes/0/4096       48556 ns        24274 ns        36713
BM_throughputForTransportAndBytes/1/4096       63926 ns        33302 ns        21678
BM_throughputForTransportAndBytes/0/8182       61992 ns        30967 ns        31588
BM_throughputForTransportAndBytes/1/8182       76709 ns        39386 ns        16124
BM_throughputForTransportAndBytes/0/16364      59111 ns        27146 ns        21538
BM_throughputForTransportAndBytes/1/16364      99768 ns        51025 ns        14223
BM_throughputForTransportAndBytes/0/32728      81425 ns        36794 ns        19077
BM_throughputForTransportAndBytes/1/32728     145483 ns        69133 ns        10000
BM_throughputForTransportAndBytes/0/65535     250483 ns       121279 ns         5994
BM_throughputForTransportAndBytes/1/65535     436443 ns       210857 ns         4502
BM_throughputForTransportAndBytes/0/65536     242461 ns       117834 ns         9015
BM_throughputForTransportAndBytes/1/65536     412841 ns       199778 ns         3333
BM_throughputForTransportAndBytes/0/65537     348937 ns       158662 ns         5700
BM_throughputForTransportAndBytes/1/65537     485328 ns       219897 ns         3345
BM_repeatBinder/0                             149947 ns        81256 ns         7093
BM_repeatBinder/1                             142770 ns        77031 ns         7460

Future considerations:
- what about other socket types (not UDS)
- control for binder scheduling hints
- more optimizations in libbinder

Bug: 182940634
Test: binderRpcBenchmark (results above)
Change-Id: I0db9a95d9336b6f943da9efe59ef7736a65f90e4